CN103368171A - Method for supplying electricity to alternating current essential load by distributed power source in direct current micro-grid - Google Patents

Method for supplying electricity to alternating current essential load by distributed power source in direct current micro-grid Download PDF

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Publication number
CN103368171A
CN103368171A CN2013102977914A CN201310297791A CN103368171A CN 103368171 A CN103368171 A CN 103368171A CN 2013102977914 A CN2013102977914 A CN 2013102977914A CN 201310297791 A CN201310297791 A CN 201310297791A CN 103368171 A CN103368171 A CN 103368171A
Authority
CN
China
Prior art keywords
switch
direct current
important load
current microgrid
power source
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN2013102977914A
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Chinese (zh)
Inventor
陈建国
王磊
潘存良
陈昌龄
刘刚
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Tianchang Power Supply Co of State Grid Anhui Electric Power Co Ltd
Original Assignee
Tianchang Power Supply Co of State Grid Anhui Electric Power Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Tianchang Power Supply Co of State Grid Anhui Electric Power Co Ltd filed Critical Tianchang Power Supply Co of State Grid Anhui Electric Power Co Ltd
Priority to CN2013102977914A priority Critical patent/CN103368171A/en
Publication of CN103368171A publication Critical patent/CN103368171A/en
Pending legal-status Critical Current

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Abstract

The invention discloses a method for supplying electricity to an alternating current essential load by a distributed power source in a direct current micro-grid. The method is characterized in that an AC/DC bidirectional transducer is arranged, the direct current end of the AC/DC bidirectional transducer is connected to a direct current bus, the alternating current end of the AC/DC bidirectional transducer is connected to an alternating current bus through a switching element set, the alternating current grid connection operating state of the AC/DC bidirectional transducer is achieved through the switching control of the switching element set, or the operating state that the direct current micro-grid directly supplies the electricity to the direct current essential load through the AC/DC bidirectional transducer is achieved. The method effectively solves the problem that coordination control among AC/DC bidirectional transducers and protecting and scheduling control of the direct current micro-grid and a main power grid are hard to match.

Description

Distributed power source is to exchanging the method for supplying power to of important load in the direct current microgrid
Technical field
The present invention relates to when electric power system is broken down exchanging the method for important load power supply, be particularly suitable for distribution density high in, low capacity photovoltaic, wind power generation power supply and energy-storage travelling wave tube be through the interconnected place of direct current microgrid.
Background technology
The direct current microgrid refers to that the distributed power generation resource of will disperse in the certain area connects small modular, the distributed direct current energy supply network that forms.The direct current microgrid can access main electrical network by the AC/DC reversible transducer, is in the state that is incorporated into the power networks that exchanges; But the power supply to responsible consumer is kept in also self-government operation.
Present research exchanges microgrid with general employing of engineering demonstration, to keep exchanging the power supply of important load.This mode problem demanding prompt solution is: how to realize exchanging under the non-failure conditions energy management and the control of the coordination between each power supply between the interior a plurality of distributed power sources of microgrid and the load, how to solve the isolation of interchange microgrid internal fault point and the problem that can isolation rear microgrid in fault point continue stable operation.
Summary of the invention
Be the deficiency of avoiding above-mentioned prior art to exist; the invention provides distributed power source in a kind of direct current microgrid to exchanging the method for supplying power to of important load; to when the direct current microgrid breaks down because of main electrical network; can realize exchanging the power supply of important load in the direct current microgrid, solve simultaneously coordination control between each AC/DC reversible transducer and direct current microgrid and major network is protected and scheduling controlling is difficult to cooperate problem.
The present invention is that the technical solution problem adopts following technical scheme:
Distributed power source to the characteristics of the method for supplying power to of interchange important load is in the direct current microgrid of the present invention: the AC/DC reversible transducer is set, the dc terminal of described AC/DC reversible transducer is connected on the dc bus, it exchanges end and is connected to ac bus by group of switching elements, switch control by group of switching elements, the interchange that the realizes described AC/DC reversible transducer state that is incorporated into the power networks, or realize by described AC/DC reversible transducer the direct-furnish of direct current microgrid being exchanged the running status of important load.
Distributed power source also is the characteristics of the method for supplying power to of interchange important load in the direct current microgrid of the present invention:
The formation of described direct current microgrid is to be connected with respectively on described dc bus: dc load, through the distributed power source of the alternative electric generation of DC/AC converter access with exchanges energy-storage travelling wave tube, and distributed power source and the dc energy storage element of the DC generation that accesses through the DC/DC converter.
Described group of switching elements is to be made of the first switch QF3, second switch QF4 and the 3rd switch QF5, the dc terminal of described AC/DC reversible transducer is connected on the dc bus, exchanging end is connected with the end of the 3rd switch QF5 with second switch QF4 respectively, another termination ac bus of described the 3rd switch QF5, the other end one tunnel of described second switch QF4 connects the end of the first switch QF3, another road connects the interchange important load, another termination ac bus of described the first switch QF3; The described interchange state of being incorporated into the power networks is: described the first switch QF3 and the 3rd switch QF5 are closed, and second switch QF4 disconnects; The running status that described direct current microgrid direct-furnish exchanges important load is: the closure of second switch QF4, and the first switch QF3 and the 3rd switch QF5 disconnection.
When the electric power system fault-free, be set to the described interchange state that is incorporated into the power networks; When electric power system fault, be set to the running status that the direct-furnish of direct current microgrid exchanges important load.
Described AC/DC reversible transducer has many groups, exchanges in described direct current microgrid direct-furnish under the running status of important load, and the interchange end of organizing the AC/DC reversible transducer does not have electrical link each other.
Described AC/DC reversible transducer switch to exchange the state that is incorporated into the power networks before, according to the voltage signal that is installed in the detected electric power incoming line of voltage transformer TV on the ac bus side electric power incoming line, voltage swing and the phase place of adjusting the interchange end output of described AC/DC reversible transducer satisfy when being incorporated into the power networks condition it, at first closed the first switch QF3, then disconnect second switch QF4, last closed the 3rd switch QF5.
Compared with the prior art, beneficial effect of the present invention is embodied in:
Disperse to be installed in the dc terminal access dc bus that exchanges near the AC/DC reversible transducer of important load among the present invention, the interchange end of AC/DC reversible transducer is connected respectively to the two ends that exchange the important load service entrance switch through switch element; When electric power system normally moved, AC/DC reversible transducer incoming transport electrical network was realized being incorporated into the power networks; When electric power system is broken down, powered to exchanging important load by the AC/DC reversible transducer; After the normal operation of power system recovery, being incorporated into the power networks of the AC/DC converter that recovers to be incorporated into the power networks.The present invention efficiently solves between each AC/DC reversible transducer the problem that control and direct current microgrid and main electric network protection and scheduling controlling are difficult to cooperate of coordinating.
Description of drawings
Fig. 1 is principle of the invention schematic diagram.
Embodiment
Referring to Fig. 1, in the present embodiment in the direct current microgrid distributed power source to the method for supplying power to that exchanges important load be: the AC/DC reversible transducer is set, the dc terminal of AC/DC reversible transducer is connected on the dc bus, it exchanges end and is connected to ac bus by group of switching elements, switch control by group of switching elements, the interchange that realizes the AC/DC reversible transducer state that is incorporated into the power networks, or realize by the AC/DC reversible transducer direct-furnish of direct current microgrid being exchanged the running status of important load.
In the present embodiment, the formation of direct current microgrid is to be connected with respectively on dc bus: dc load, through the distributed power source of the alternative electric generation of DC/AC converter access with exchanges energy-storage travelling wave tube, and distributed power source and the dc energy storage element of the DC generation that accesses through the DC/DC converter.
Group of switching elements is to be made of the first switch QF3, second switch QF4 and the 3rd switch QF5, the dc terminal of AC/DC reversible transducer is connected on the dc bus, exchanging end is connected with the end of the 3rd switch QF5 with second switch QF4 respectively, another termination ac bus of the 3rd switch QF5, the other end one tunnel of second switch QF4 connects the end of the first switch QF3, another road connects the interchange important load, another termination ac bus of the first switch QF3; The interchange state of being incorporated into the power networks is: the first switch QF3 and the 3rd switch QF5 are closed, and second switch QF4 disconnects; The running status that the direct-furnish of direct current microgrid exchanges important load is: the closure of second switch QF4, and the first switch QF3 and the 3rd switch QF5 disconnection.
When the electric power system fault-free, be set to exchange the state that is incorporated into the power networks; When electric power system fault, be set to the running status that the direct-furnish of direct current microgrid exchanges important load.
The AC/DC reversible transducer can have many groups, exchanges in the direct-furnish of direct current microgrid under the running status of important load, and the interchange end of organizing the AC/DC reversible transducer does not have electrical link each other.
The AC/DC reversible transducer switch to exchange the state that is incorporated into the power networks before, according to the voltage signal that is installed in the detected electric power incoming line of voltage transformer TV on the ac bus side electric power incoming line, voltage swing and the phase place of adjusting the interchange end output of AC/DC reversible transducer satisfy when being incorporated into the power networks condition it, at first closed the first switch QF3, then disconnect second switch QF4, last closed the 3rd switch QF5.
The output of the interior various distributed power sources of direct current microgrid and energy-storage travelling wave tube is same direct voltage grade among the present invention, is connected on the same dc bus.

Claims (6)

  1. In the direct current microgrid distributed power source to exchanging the method for supplying power to of important load, it is characterized in that: the AC/DC reversible transducer is set, the dc terminal of described AC/DC reversible transducer is connected on the dc bus, it exchanges end and is connected to ac bus by group of switching elements, switch control by group of switching elements, the interchange that the realizes described AC/DC reversible transducer state that is incorporated into the power networks, or realize by described AC/DC reversible transducer the direct-furnish of direct current microgrid being exchanged the running status of important load.
  2. In the direct current microgrid according to claim 1 distributed power source to exchanging the method for supplying power to of important load, it is characterized in that: the formation of described direct current microgrid is to be connected with respectively on described dc bus: dc load, through the distributed power source of the alternative electric generation of DC/AC converter access with exchanges energy-storage travelling wave tube, and distributed power source and the dc energy storage element of the DC generation that accesses through the DC/DC converter.
  3. In the direct current microgrid according to claim 1 distributed power source to exchanging the method for supplying power to of important load, it is characterized in that: described group of switching elements is by the first switch QF3, second switch QF4 and the 3rd switch QF5 consist of, the dc terminal of described AC/DC reversible transducer is connected on the dc bus, exchanging end is connected with the end of the 3rd switch QF5 with second switch QF4 respectively, another termination ac bus of described the 3rd switch QF5, the other end one tunnel of described second switch QF4 connects the end of the first switch QF3, another road connects the interchange important load, another termination ac bus of described the first switch QF3; The described interchange state of being incorporated into the power networks is: described the first switch QF3 and the 3rd switch QF5 are closed, and second switch QF4 disconnects; The running status that described direct current microgrid direct-furnish exchanges important load is: the closure of second switch QF4, and the first switch QF3 and the 3rd switch QF5 disconnection.
  4. 4. distributed power source is characterized in that exchanging the method for supplying power to of important load in the direct current microgrid according to claim 1: be set to the described interchange state that is incorporated into the power networks when the electric power system fault-free; When electric power system fault, be set to the running status that the direct-furnish of direct current microgrid exchanges important load.
  5. In the direct current microgrid according to claim 1 distributed power source to exchanging the method for supplying power to of important load, it is characterized in that: described AC/DC reversible transducer has many groups, exchange in described direct current microgrid direct-furnish under the running status of important load, the interchange end of organizing the AC/DC reversible transducer does not have electrical link each other.
  6. In the direct current microgrid according to claim 1 distributed power source to exchanging the method for supplying power to of important load, it is characterized in that: described AC/DC reversible transducer switch to exchange the state that is incorporated into the power networks before, according to the voltage signal that is installed in the detected electric power incoming line of voltage transformer TV on the ac bus side electric power incoming line, voltage swing and the phase place of adjusting the interchange end output of described AC/DC reversible transducer satisfy when being incorporated into the power networks condition it, at first closed the first switch QF3, then disconnect second switch QF4, last closed the 3rd switch QF5.
CN2013102977914A 2013-07-15 2013-07-15 Method for supplying electricity to alternating current essential load by distributed power source in direct current micro-grid Pending CN103368171A (en)

Priority Applications (1)

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CN2013102977914A CN103368171A (en) 2013-07-15 2013-07-15 Method for supplying electricity to alternating current essential load by distributed power source in direct current micro-grid

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CN2013102977914A CN103368171A (en) 2013-07-15 2013-07-15 Method for supplying electricity to alternating current essential load by distributed power source in direct current micro-grid

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105656079A (en) * 2016-01-29 2016-06-08 北京天诚同创电气有限公司 Bypass switching circuit, converter and DC networking converter system
CN106253261A (en) * 2016-08-17 2016-12-21 上海电机学院 A kind of distributed mixed DC micro-grid system
CN106452110A (en) * 2016-11-18 2017-02-22 广州智光电气股份有限公司 Power conversion apparatus and microgrid

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US6949843B2 (en) * 2003-07-11 2005-09-27 Morningstar, Inc. Grid-connected power systems having back-up power sources and methods of providing back-up power in grid-connected power systems
CN102169342A (en) * 2011-05-13 2011-08-31 吉林省电力有限公司电力科学研究院 Distribution network coordination control system and control method taking account of distributed power
CN201956701U (en) * 2011-03-12 2011-08-31 云南电力试验研究院(集团)有限公司 Single house type AC (Alternating Current)/DC (Direct Current) mixing microgrid
CN202817753U (en) * 2012-06-13 2013-03-20 中国东方电气集团有限公司 Microgrid system structure based on comprehensive application and research

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6949843B2 (en) * 2003-07-11 2005-09-27 Morningstar, Inc. Grid-connected power systems having back-up power sources and methods of providing back-up power in grid-connected power systems
CN201956701U (en) * 2011-03-12 2011-08-31 云南电力试验研究院(集团)有限公司 Single house type AC (Alternating Current)/DC (Direct Current) mixing microgrid
CN102169342A (en) * 2011-05-13 2011-08-31 吉林省电力有限公司电力科学研究院 Distribution network coordination control system and control method taking account of distributed power
CN202817753U (en) * 2012-06-13 2013-03-20 中国东方电气集团有限公司 Microgrid system structure based on comprehensive application and research

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105656079A (en) * 2016-01-29 2016-06-08 北京天诚同创电气有限公司 Bypass switching circuit, converter and DC networking converter system
CN106253261A (en) * 2016-08-17 2016-12-21 上海电机学院 A kind of distributed mixed DC micro-grid system
CN106452110A (en) * 2016-11-18 2017-02-22 广州智光电气股份有限公司 Power conversion apparatus and microgrid
CN106452110B (en) * 2016-11-18 2019-01-01 广州智光电气股份有限公司 A kind of power-converting device and micro-capacitance sensor

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